emit short signal for a low and for a high ppm threshold #5
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…einer 500 sinkt (Hysterese)
ernstkl
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Signal fresh air being reached with a short acoustic signal:
triple short beep
when ppm falls below 500 ppm.
Signal buzzer level imminent with a short acoustic signal:
long-short beep
when ppm rises above "buzzer-level minus 100".
For both events a 100 ppm hysteresis is applied.